# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#.rst:
# FindLua51
# ---------
#
#
#
# Locate Lua library This module defines
#
# ::
#
#   LUA51_FOUND, if false, do not try to link to Lua
#   LUA_LIBRARIES
#   LUA_INCLUDE_DIR, where to find lua.h
#   LUA_VERSION_STRING, the version of Lua found (since CMake 2.8.8)
#
#
#
# Note that the expected include convention is
#
# ::
#
#   #include "lua.h"
#
# and not
#
# ::
#
#   #include <lua/lua.h>
#
# This is because, the lua location is not standardized and may exist in
# locations other than lua/

find_path(LUA_INCLUDE_DIR lua.h
  HINTS
    ENV LUA_DIR
  PATH_SUFFIXES include/lua51 include/lua5.1 include/lua-5.1 include/lua include
  PATHS
  ~/Library/Frameworks
  /Library/Frameworks
  /sw # Fink
  /opt/local # DarwinPorts
  /opt/csw # Blastwave
  /opt
)

find_library(LUA_LIBRARY
  NAMES lua51 lua5.1 lua-5.1 lua
  HINTS
    ENV LUA_DIR
  PATH_SUFFIXES lib
  PATHS
  ~/Library/Frameworks
  /Library/Frameworks
  /sw
  /opt/local
  /opt/csw
  /opt
)

if(LUA_LIBRARY)
  # include the math library for Unix
  if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU)
    find_library(LUA_MATH_LIBRARY m)
    set( LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY}" CACHE STRING "Lua Libraries")
  # For Windows and Mac, don't need to explicitly include the math library
  else()
    set( LUA_LIBRARIES "${LUA_LIBRARY}" CACHE STRING "Lua Libraries")
  endif()
endif()

if(LUA_INCLUDE_DIR AND EXISTS "${LUA_INCLUDE_DIR}/lua.h")
  file(STRINGS "${LUA_INCLUDE_DIR}/lua.h" lua_version_str REGEX "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua .+\"")

  string(REGEX REPLACE "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([^\"]+)\".*" "\\1" LUA_VERSION_STRING "${lua_version_str}")
  unset(lua_version_str)
endif()

INCLUDE(FindPackageHandleStandardArgs)
# handle the QUIETLY and REQUIRED arguments and set LUA_FOUND to TRUE if
# all listed variables are TRUE
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Lua51
  REQUIRED_VARS
    LUA_LIBRARY
    LUA_INCLUDE_DIR
  VERSION_VAR
    LUA_VERSION_STRING)

mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARIES LUA_LIBRARY LUA_MATH_LIBRARY)

IF(Lua51_FOUND AND NOT TARGET LUA51::LUA51)
  ADD_LIBRARY(LUA51::LUA51 UNKNOWN IMPORTED)
  SET_TARGET_PROPERTIES(LUA51::LUA51 PROPERTIES
    IMPORTED_LOCATION
      "${LUA_LIBRARY}"
    INTERFACE_INCLUDE_DIRECTORIES
      "${LUA_INCLUDE_DIR}"
    INTERFACE_LINK_LIBRARIES
      "${LUA_MATH_LIBRARY}"
   )
ENDIF()

